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Freebase(0.00 / 0 votes)Rate this definition: Log flume. A log flume is a flume specifically constructed to transport lumber and logs down mountainous terrain to a sawmill by using flowing water. These watertight trough-like channels could be built to span a long distance across chasms and down steep mountain slopes.
Log Flumes must be designed carefully, or they can go on forever. A Log Flume's only speed comes when it goes downhill, otherwise it goes at the boring pace of 2-3 mph. Use the slow speeds to develop a theme, and then climax with a big drop to keep guests coming back for more.